Air conditioner



A P' CLARK AIR counlnom Fil Jm 1. 1944 3 Sheet.s..shest 1 J7 Q l HIM 9Je Y /6 a.; v uw Ei 7 n 9 ,g :1K

u /5/2 B A l0 I 25 4a *Jl 44 mmm BY I

, A. P. CLARK AIR CONDITIONER Jan. 7, 1947.

Filed Juno 1, 1944 3 Sheets-Sheet 2 A. P. CLARK 2,414,020

AIR GONDITIONER Filed June 1. 1944 3 Sheets-Sheet 3 miams. MDW R CLARK.

Patented Jan.` 7, i947 UNITED S'I'I'IES PATENT GFI-'ICE AIR coNDI'rIoNERAndrew P. Clark, Louisville, Ky. Application June 1, 1944, Vserial No.538,252

7 Claims. 1

This invention relates to an air conditioner, and embodies asrone of itsprincipal features the use f stem jets and refrigerated surfacesproperly related, to effect a thorough separation of impurities andforeign particles from air passing therethrough. The device of theinvention may be constructed in different sizes and capacities, to adaptit to any of the numerous existing circumstances under which thepurifying of air may be considered necessary or desirable The device mayalso temper the air and establish a desired humidity, as Awill beexplained, and its operation may be rendered fully automatic by the useof controls such as are disclosed herein. It is capable of renderingwholesome and fit for human consumption, air which is foul and ladenwith dust, dirt, smoke, odors and such other impurities and particles asare commonly found in unclean air.

The advantages .and accomplishments above stated are among the objectsof the invention,

others of which are: to provide an automatic device of the characterstated, which Will'operate noiselessly, efficiently, and Without careinv service; to provide a device capable of purifying air to a degreenot attainable with the use of air lters or screens; to incorporate inthe apparatus an automatic means for periodically disposing of entrappedparticles and substances accumulated as impurities during the operatingperiods of the device.

The foregoing and other objects are attained by the meansA describedherein and disclosedin the accompanying drawings, in which:

Fig. 1 is a perspective view of the device of the invention, parts beingbroken away for clarity of illustration.

Fig. 2 is a viewl showingthe elements of an electrical automatic controlmeans for the device, including the wiring diagram.

Fig. 3 is a cross-sectional View taken on line 3 3 of Fig. 2, showing anautomatic defrosting switch.

Fig. 4 is an enlarged cross-sectional view of an air-steam mixer, shownon a smaller scale and in elevation upon Fig. 1.

Fig. 5 is a perspective view, parts broken away, showing a modifiedcondensing unit for the device, which is substitutable for thecorresponding unit of Fig. 1.

The apparatus of this invention depends upon the use of a steamtreatment, followed immediately by a low temperature condensing andseparating action of a refrigeratingmeans, for removing foreignparticles, smoke, odors and other impurities from air, and restoring tothe treated air the wholesomeness, cleanliness, humidity andtemperature,characteristics desired in air fit for human consumption orfor other uses.

To treat the unclean air, it is rst drawn into the apparatus by means ofa fan, and subjected to a, thorough intermixing with steam from ahumidifying refrigerating means disposed in the pa'th of air movement.

VThe dehumidifying 'character of the refrigerating'or chilling means forthe air undergoing treatment, is to be especially noted anddistinguished from chilling means of the character which adds moistureto the air undergoing treatment. Water spraysand the like fall into thecategory of the latter type of chilling means, and are wholly unsuitedfor use in an apparatus of the kind herein disclosed. In other words,the air undergoing treatment is not to be subjected to direct Contactwith the cooling medium, but should be chilled by passing it alongrefrigerated surfaces upon which the steam-treated particles andimpurities may condense as a slime, while at the same time the airundergoes substantial dehumidication.

lAfter the treatment above described, the air in the thoroughly cleanedcondition may be tempered automatically to room temperature, or to anyother desired temperature, if necessary or chambers thereof desirable,before being exhausted from the apf paratus.

The operation of the device may be rendered fully automatic by means ofcertain controls to be herein disclosed, and provision is made forautomatic periodic disposal of accumulated particles and impurities fromthe condensing Proper conditioning of the air for temperature may beattained by associating with the apparatus a suitable t-hermcstaticcontrol, and preferably one including a proportioning thermostatarrangement, although it is feasible to provide a manual control forthis purpose as will be explained.

Referring to Fig. 1 of the drawings, the device comprises in general acasing 'l including an upper aperture preferably furnished with a grill`through which may enter the f'cul air to be cleansed and conditioned.The foul air inlet may be divided into twosections, indicated at 8 and9, and the space beneath said vgrill sections may be divided into a pairof compartments established by Walls I and I2 whichextend'across thefu'l width of the casing. Each compartment includes a suction fanl fordrawing air into the device through the grills 8 and 9, said fans beingmdrcated by the characters I3 and I4. The fans are disposed vat theopposite sides of partition wall, I2,

andif desired they may be mounted upon a common shaft with an interposedelectric motorl| 5 in driving relationship thereto.

Suction fan I3 operates to draw foul air into the compartment thatcommunicates with grill opening 9, and drives the air past a boilerindicated at B for dissipating surrounding heat and discharging theheated air through an exhaust pipe I6, which may lead to the atmosphereexteriorly of the room or space in which the air conditioning device islocated. This same compartment may contain the customary heat transfercoil (not shown) of the compressor 30.

Exhaust fan I4 drives foul air through the grill opening 8 and forcesthe air into a conduit. I1 leading to mixer I8, where steam from theboiler is intimately associated with the air.' Boiler steam is conveyedto the mixer by means of pipe I9. From the mixer, the air-stream mixtureis carried by way of a conduit 2U, to the lower end of a refrigeratedcondensing chamber 2|, which includes a number of alternately slopingand overlapping baies 22 upon which may accumulate the foreign particlesand impurities borne by the airsteam mixture. In traveling upwardlythrough the refrigerated condensing chamber 2|, the air is forced totravel overv the cold surfaces of ,all of the baiesalong a circuitouspath until it reaches the upper end of chamber 2|, where by means of aconnecting conduit 23,l the air is transferred to the upper end of asecond refr'gerated condensing chamber 24 constructed similarly to thechamber 2|. Air entering the refrigerated chamber 24 passes downwardlyalong the series of baffles contained therein, and'nally leaves chamber24 through a duct 25. A suction is maintained in duct 25 by means of anexhaust fan 26 driven by belt or otherwise from a main driving motor M.The character 2l indicates the belt or chain passing over the motorpulley, the pulley 28 of the exhaust fan, and the pulley 29 of acompressor for the refrigerating system. The compressor is indicated bythe character 30, and may be of conventional design.

With the aid of exhaust fan 26, air is with- 4 erating` system. Therefrigerating system preferably is of the direct expansion type.

' As will be understood, the upper ends of chambers 2|, 33 and 24, areclosed by means of a suitable cap bearing insulating material 31. Infact, the entire refrigerating unit comprising the compartments 2|, 33,24 is preferably encased within an insulating shell, indicated at 38,for enhancing the eiliciency of the device as a whole.

As previously stated herein, the refrigerating coils and the chambers2|, 33 and 24 are adapted to be periodically defrosted automatically,wherefore, each of said chambers is provided with a drain opening in itsbottom wall, as indicated at 39, leading to a common drain pipe 4U thatmay carry to the sewer such waste products as will be dislodged from thewalls and baflies of the several chambers during the defrosting period.The characters 4| indicate sealed flushing tubes through whichquantities of water may be introduced for flushing the bailies wheneveriiushing of the conipartments seems to be necessary or desirable.

Upon the basis of the foregoing description, it will be understood thatthe device when in operation, will draw foul air into the grill opening8, through blower i4, and said air. wil1 pass through the air-streammixer I8 wherein the temperature of the air is elevated to destroy odorsand certain bacteria, while at the same time the air-borne particles offoreign matter are moistened and possibly expanded with a resultantincrease of weight or volume. From the mixer I8, the air travels throughduct 20 to the lower end of the refrigerated chamber 2|, the walls andbaiiles of which are maintained at a very low temperature. During itstravel through chamber 2 I, the air loses a great deal of its humidity,while at the same time a considerable amount of foreign particles "andimpurities carried thereby are condensed drawn from the refrigeratedcondensing chamber 24 by way of conduit 25, and projected from themachine through the grill opening 3|.

Near the upper end of Fig. 1 is illustrated a system of cooling orrefrigerating coils 32 contained within a coil compartment 33 andpassing through a multiplicity of cold conducting fins 34 which, along'their vertical side edges, are held in intimate contact with theadjacent side walls of both condensing chambers. The coils and finspreferably ll the coil chamber from top to bottom, and are capable oflowering the'temperature of the condensing chambers considerably belowthe freezing point of water. The coils have terminal` portions 35 and 36associated in the 'conventional manner with compressor 30 and suchaccompanyupon the walls and baffles of the chambers. Passing over to thesecondary refrigerated chamber 24, by way of duct 23, furthercondensation of moisture and removal of particles and impurities takesplace, until at the end of its travel, the treated air leaves by way ofduct 25 and is discharged into the room through the outlet 3|.

It should be appreciated that the air, after having been saturated andthoroughly intermixed with steam and brought to a relatively hightemperature in the mixing chamber I8, is immediately subjected to thedry-chilling action of the condensing and dehumidifying bafes and wallsof the refrigerated chambers 2| and 24. It is important'to note that thechilling is accomplished in a dry atmosphere, so that the air undergoingtreatment is materially dehumidified after having been steam-treated,with the result that it is rendered properly humid for human consumptionby the time it is discharged through the outlet 3|. The humidity of thecleansed air may be further controlled, if desired, by adding steam ormoisture thereto after it leaves the secondary lcondensing chamber,should the humidity be found too low after the air has been treated asexplained.

The explanation which follows is devoted particularly to the automaticcontrols for the apparatus. At the location 42 is indicated a swingingdamper disposed within the conduit 25, and adapted to shunt air from thesecondary. condensing chamber 24 to a conduit 43 that enters boiler Band returns from the boiler to connect with conduit 25 at the location44. The purpose of conduit 43 is to subject the treated air to thetempering action of the boiler, in the event that the treated air is toocold to discharge into the room occupied by the air conditioningapparatus. During the summer season the damper 42 may completely closethe conduit 43 so that all of the treated air may pass freely to theblower 26 and be exhausted at 3|. season, it maybe desirable to shuntall or a portion of the treated air to the boiler for tempering it priorto discharge. vided, including preferably a proportioning thermostatcontrol means, for establishing various positions of damper 42 wherebyvarying amounts of treated air passing through duct may be shunted tothe boiler and thereafter mixed with the cold air at the port 44. Themechanism about to hbe explained, and which is illustrated by Figs. 2and 3, serves to'automatically regulate the po- However, during thewinter,

Automatic means are prosition of the damper and to thereby regulate thei temperature of air discharged through the ports.

It may be here pointed out, that conduit 43 enters the boiler B belowthe water level therein, and continues through the boiler withoutinterruption, so that none of the water or steam of the boiler is placedin contact with the air in said conduit as the air is subjected to thetempering action of the boiler water heat.

The element indicated at 45 of Figs. 1 and.2,

represents an electrical control means for initiating a defrostingperiod, which occurs whenever the products of condensation w-ithinchambers 2| and 24 become so voluminous as to interfere with themovement of air therethrough.. The device at 45 may comprise a housinghaving open ends 46 and' 41, which may he screened as shown, and throughwhich may pass a portion of the air flowing through the discharge duct25. The housing of the element 45 may carry a transversely arrangedshaft 48 upon which is rockably mounted a metallic leaf or vane 49responsive in move- Y ment to the velocity of air entering theopening 46and leaving through the opening 41. By providing the leaf or vane with aweighted end 50 furnished with a series of openings 5I, the leaf or vanemay be so balanced as to assume a nearhorizontal position when actedupon by air of sufcient velocity traveling in the direction of thevarrow 52 of Fig. 2. Upon a substantial decrease in whenever the deviceis operating with a free and relatively unrestricted flow of air throughthe refrigerated condensing chambers.

With further reference to'Fig. 2, 56 indicates the prime mover, which inthis instance is an electric motor, constituting part of a timing switchwhose electrical contacts are indicated at 51 and 58. The showing ofthis timing switch is conventional only, and it is intended that anycommercial form of timing switch may be substituted therefor. As shown,the timer includes a worm 59 von the shaft of motor 56 engaging theteeth of a worm wheel 66 rotatably mounted upon shaft 6I that carries alradial arm 62 adapted to be swung upwardly for moving the electriccontact 58 into a position of abutment with contact 51. Suchadvancingmovement ofarm 62 is to be performed very slowly, through the gearingassociated with motor 56. At any time during which the motor isdeenergized, a spring 63 serves to retract arm 62 from the electricalcontact 58, for allowing contacts 51-58 to open. The time required forarm 62 to advance to effect a closing of the switch 51-56, shouldapproximate the time required for defrosting of the condensing chambers2| and 24. For this purpose, the timing switch may include a suitableadjustment which is common to such switches, but not believed necessaryto illustrate herein.

At the lower end of Fig. 2 is illustrated a proportioning motor, thepurpose of which is to swing the damper 42 to various positions betweenthe fully open and fully closed positions with respect tothe openadjacent end of conduit 43, (Fig. 1), in response tol the changing.demands of a room thermostat T. Motors of this type are available asMinneapolis-Honeywell, Series proportioning controls, and such motorscomprise usually a pair of rotors 65 and 66 fixed on a common shaft 61to be rocked in opposite directions of rotation by the rotors, dependingupon electrical energization of one or the other of the field coils68er. 69. By energizing coil 68, for example, a partial rotation ofrotor 65 is effected in the direction of the arrow applied thereto,whereas coil 65 upon being energized causes rotor 66 to partially rotatein the opposite direction,

to thereby change the position of the damper 42, aflxed to shaft 61. Thepartial or limited rotational movements of shaft 61 and damper 42, aredetermined by the changing demands of the thermostat T, and the amountof such rotational movements is proportional to thel change ofconditions noticed by the thermostat. rI hus, the damper may beautomatically adjusted at all times, to shunt varying amounts of air toboiler B for tempering the air finally discharged at grill 3l.

The electrical circuit of the proportioning control comprises a woundresistance A--C over which moves a contact slide P. This resistance maybe energized by low voltage current from a transformer 10, whose primarywinding is across the main line conductors. The resistanceis connectedacross the conductors 1l and 12 by means 'of the leads 13 and 14.Connected across said conductors also is the proportioning relayconsisting of a pair of coils N-D, operative to shift an armature Q inopposite directions, to open or close the switches 15 and 16 by means ofthe movable switch blade 11 mechanically connected with the armature.

A balancing potentiometer, associated with the motor shaft 61, isrepresented by the characters J-K which identify a wound resistanceelement over which the' contact slide H is moved. The travel of thisslide is controlled by operation of the proportioning motor so that asthe shaft 61 moves its maximum amount in both directions of rotation,the slide is moved across the balancing potentiometer winding JK. Thesliding contact H may be carried by an arm 1B fixed to shaft 61.

y To describe the operation, it may be assumed that the slide contacts Pand H are in the center position as shown by the diagram. Under these`circumstances, the resistances AP, P-C, J-H and H-K are all equal, andcurrent owingin coil N is equal to that flowing in coil D, of the switchactuator. The armature Q will then be acted on by equal magnetic forcesfrom coils N and D, and switch blade 11 will be held in a neutralposition between the contacts of `witches T will cause the contactor Pto move towardA.

This will immediately unbalance the electrical system as the resistance'A-P will then be less than P-C. The netresult will be that more currentwill flow in the circuit of coil D, than in the circuit of coil N.Armature Q therefore will kmove, due to the increased magnetic effect ofcoil D, to carry switch blade 11 to the right, for

closing the switch 16. With this switch closed, current will flowthrough the circuit 1|, 19,

switch 16 and conductors 80, 69, 8| and 1.2. 15

Thus, the rotor 66 will be energized to partially rotate the shaft l61and move the damper 42 toward open position.

As the rotor moves, the balancing potentiometer slide H is mechanicallymoved toward the 20 end of its resistance marked J. When the increase inthe resistance H-K has overcome (balanced) the lowered resistance A--Pin the thermostat, such that the elect of A--P land H-K is equal to theeffect of P-C and J-H, then the coils N and D will again exert equalinfluence on armature Q. This will cause the armature to Acenter itselfagain, and to open the switch 16,

stopping the rotor 66. Having taken up this newv position, which isexactly in proportion to the increased heat\ demand at the thermostat,the proportioning motor remains at rest until a new demand at thethermostat again ,unbalances the circuit.

8 solenoid thereupon immediately moves to open the switch 85 to stop themain drive motor M. With the resultant absence of air flow through duct2-5 and housing 4,5, the switch 49-54 remains closed and keeps inoperation the timer motor 56. The timer motor operates for a period oftime, perhaps an hour or less, until it advances the arm 62 to positionfor closing the switch contacts 51-58, whereupon current will be inducedto ow to the main drive motor M by way of conductors 83, 84, 92, 58, 51,93 and 86. By this time, the condensing chambers have defrostedsuiiiciently to' permit a free ilow of air therethrough, and thevelocity thereof will be sufficient to again open the defroster switchcontacts at 5,4--49. As this switch opens, the coil 89 of magneticswitch 85 will be deenergized, and switch 85 wil1 close by spring actionto maintain a closed circuit through the main drive motor M, while thetimer arm 62 returns to a retracted position under the influence of itsspring 63, permitting contacts 51-58 to spring apart to normality. Themotor M then continues to operate the air conditioner until defrostingagain becomes necessary and isv initiated sity of demand of thethermostat. In less ex- In like manner anV increase of heat atthe`thermostat will result in moving the contactar P toward C, makingP-C of less resistance than A-P, and increasing the 4current flowthrough coil N. The corresponding increased magnetic pensive models ofthe apparatus, however, vthe da-mper 42 may be manually adjusted byproviding suitable actuating means accessible exeffect of` coil N willmove armature Q to the left, 40

thereby closing the blade 11 upon the contacts of switch 15 andcompleting the circuit through the eld coil 68 of rotor 65. The rotor 65will thereby kc energized to rotate shaft 61 and damper 42 in theopposite direction. or toward 45 the closed damper position, until slideH of the, balancing potentiometer reaches a point on the resistancewhere a balancev -iS eected. Then armature Q will again neutralizethe'switch blade 11 tc the Fig. 2 position, to stop the proportioning 50motor.

It will be noted that the automatic action above described maintainsalways a balance between the demands of the thermostat and the positionof the damper, resulting in true modulation of heat delivery throughgrill 3|.

Concurrently with the foregoing operation, the

main drive motor M is continuously energized by current flowing from theline wires over con-v ductors 83, 84, switch 85, `and conductor 86, the

l 'switch 85 being normally spring-closed as shown,

while the defrosting control switch 54-49 is` open-circuted. Eventually,however, the condensing chambers of the apparatus will become 4ladenwith foreign matter that will restrict the 65 the switch contact at 54,as indicated by the broken lines on Fig. 2. Closing of this switch at 54establishes a ilowvof current .through the circuit comprising theconductor 81, switch 49-54, conductor 9|, motor 56, conductor 88, thesolenoid coil 89 of switch 85, and conductor 90. The 7-5 teriorly of thecabinet, as will readily be understood. The proportioning controls thenmayl be eliminated, with retention of the automatic defrosting feature,if desired. Upon Fig. 1, vthe character 94 indicates a suitablysupported hous ing or casing forv the timing switch, the proportioningmotor, and their cooperative electrical adjuncts.

Fig. 4 illustrates a representative form of airsteam mixer, such as isindicated at I8 of Fig. 1. The mixer may comprise the enlarged chamber95 including a series of bailes 96 to furnish a cireuitous or tortuouspath for .the air as steamfrom jets 91 is directed into the flow of air.The steam jets 91 are furnished in suflicient numbers to effect asterilizing and thorough saturating of the air Within the mixer, andsaid jets may be fed by a manifold or jet head indicated at 98. Othertypes of mixers, of course, may be substituted for the mixer hereinshown, if desired. The steam generator or boiler B may be operatedelectrically or by means of liquid or gaseous fuel, and will preferablyinclude the customary safety devices or controls to prevent explosionand to regulate the amount of steam generated. In Fig. 5 is illustrateda condensing .unit of modified design, which may be substituted bodilyfor the condensing unit disclosed in Fig. 1. In the modified unit, 99and |06 indicate condensing chambers which are similar to the chambers2| and 24 of Fig. l, in that each contains a series of baiiies aspreviously explained, for the purpose of directing steam-treated airalong a circuitous route for condensing therefrom the excess moistureladen with foreign particles and impurities. The air-steam mixtureenters one condensing chamber through the conduit 20, and aftertreatment the air leaves the other conandere lWith further reference toFig. 5, it will be noted that the cooling coil for the condensingchambers is spirally wound exteriorly of the condensing chamber walls,the coil beginning at and ending at- |02. The portion |02 will becarried to the compressor as Fig. 1 illustrates, and coil |0| willinclude an expansion valve |03 such as is Agenerally employed inconnection with direct expansion refrigerating apparatus. In order toestablish the best possible conductivity for effectively cooling thecondensing chambers,

the coil should be`made to contact the walls of .the chambers along theextent of its length. In-

timacy of contact may be enhanced by thermally uniting the coil with thewalls of the condensing chambers, as by soldering, bracing, or the like.The reference character |04 indicates the convolutions of the directexpansion coil disposed about the exterior surfaces of the condensingchambers.

The flow of air through the condensing chambers, and the reactionobtained thereby, are precisely as was explained in c'onncction withFig. i.

Thus, a connecting duct |05 is shown spanning y the condensingvchambers.' The length of duct |05 will depend upon the space betweencondensing chambers, which space may be much less than is illustrated byFig. 5 when compactness is required in manufacture of the apparatus.Each condensing chamber is closed by means oi' a top wall E06, and thebottom wall |01 of each is provided with a drain opening |00 leading toa drain pipe |09 for disposing of condensation products when thecondensing chambers are de frosted periodically, in accordance withprevious explanation.

It may be noted that the condensing chambers are completely encasedwithin a shell ||0 spaced therefrom, in order that water of condensationmay gravitate down the outside surfaces of the condensing chambersduring defrosting, and enter a drain opening I2 provided in the bottomwall H3 of the shell. From the foregoing,

it will be evident that the condensing chambers of Fig. 5 requiredrainage both interiorly and exteriorly thereof during the deirostingperiod, but that the interiors of the chambers will contain the foreignparticles and impurities directed thereto through the duct 20.

In order to conserve energy and enhance the eciency of the unit, allouter surfaces of the shell i I0 may be furnished with insulatingmaterial as indicated at ill. The condensing chambers may be equippedwith normally sealed flushing tubes such as are indicated at 4| of Fig.1, said tubes being represented at I I5 in the Fig. 5 modiiication. Asstated, the condensing unit of Fig. 5 may be bodily substituted for thecoresponding structure disclosed in Fig. 1, wherefore, it is deemedunnecessary to include in Fig. 5 the duplicate showing of the boiler,mixer, fans and control units of Figs. 2 to 4 inclusive. Theunderstanding is that all of the mechanism ofFig. 1 shown at ,the rightof the insulating panel H6, is associated with the unit illustrated byFig. 5.

It is to be understood that in commercial practice. variousmodifications and changes in the structural details of the device may bemade, within the scope of the appended claimsI without departing fromthe spirit of the invention.

What is claimedv is: I

1. An air conditioning apparatus comprising in combination, a steamgenerator having a steam discharge jet, .means for moving foul airgpastthe let to effect an intimate intermixing of the air with steam, achamber including refrigerated surfaces in the path of air-steammovement, acting upon the mixture to dehumidify same and to extract andaccumulate condensation products therefrom, means dependent upon areduced velocity of air through the chamber resulting from accumulationof the condensation products, for defrosting the refrigerated surfacesof said chamber, and thermostatically controlled means rfor shunting tothe steam generator a portion of the cleansed `and dehumidied airdischarged from said chamber to rehcat the same.

2. An air conditioning apparatus comprising in combination. a steamgenerator having a steam discharge jet, means for moving foul air pastthe iet to effect an intimate intermixing of the air with steam, achamber including refrigeratedA surfaces in the path of air-steammovement, acting upon the mixture to dehumidify same and to extract andaccumulate condensation products therefrom, means dependent upon areduced velocity of air through the chamber resulting from accumulationof the condensation'prcducts, for defrosting the refrigerated surfacesof said chamber, and means for shunting to the steam generator a portionof the cleansedand dehumidiiled air discharged from said chamber toreheat the same.

3. An air conditioning apparatus comprising in combination, a steamgenerator having a steam discharge jet, means for moving foul air pastthe jet to eiect an intimate intermixing of the air with steam, achamber including refrigerated surfaces in the path of air-steammovement, acting upon the mixture to dehumidify same and to extract andaccumulate condensation products therefrom, means dependent upon areduced velocity of air through the chamber resulting from accumulationof the condensation products, for defrosting the refrigerated surfacesof said chamber, meansfor conveying a dushing duid to the chamber, and adrain for disposal of the flushing iiuid and the foreign substancedislodged thereby in passing over the refrigerated surfaces and throughthe chamber.

4. An air conditioning` apparatus comprising-in combination, a steamdischarge jet, means for moving unclean air past the jetand intointimate association with the steam, 'to destroy odors and saturate theair with moisture, a dehumidifying condensing Achamber including an airentry port and an air discharging port, for the continuous movement of acurrent of air through the cham` ber, refrigerating means locatedexteriorly oi' said chamber for maintaining the chamber walls below thefreezing temperature of wtaer, spaced baille means within the chamberand associated with the cold walls theerof to transfer to said walls theheat of the air-steam mixture moving through the chamber and across thebaille means therein, and means for draining the chamber of accumulatedmatter condenser upon the Walls and baiiies thereof.

5. An air conditioning apparatus comprising in combination, a steamdischarge jet, means for 1 1 moving unclean air past the jet and intointimate association with the steam, to destroy odors and saturate theair with moisture. a dehumidifying condensing chamber including an airentry port and an air discharging port, for the continuous movement of acurrent of air through the chamber, refrigerating means locatedexteriorly of said chamber for maintaining the chamber walls below thefreezing temperature of water, spaced baille means within the chamberand associated with the cold walls thereof to transfer to said walls theheat of the `air-steam mixture moving through the chamber and across thebaille means therein, means for draining the chamber of accumulatedmatter condensed upon the walls and baffles thereof, and meansresponsive to a reduced velocity of air leaving the discharging port ofthe condensing chamber, for initiating a temporary suspension ofoperation of the 'refrigeraty ing means.

6. An air conditioning apparatus comprising in combination. a steamdischarge jet, means for moving unclean air past the jet and intointimate association with the steam, to destroy odors and saturate theair with moisture, a dehumidifying condensing chamber including an airentry port and an air discharging port, for the continuous movement of acurrent of air through the chamber, refrigerating means locatedexteriorly of said chamber for maintaining the chamber walls below thefreezing temperature of water, spaced baffle means within the chamberand associated with the cold lWalls thereof to transfer to said wallsthe heat of the air-steam mixture moving through the chamber and acrossthe baille means therein, and means for draining the chamber ofaccumulated matter condensed upon the walls and baiiles thereof, aconduit for conveying 12 cleansed air from the discharging port, asuction fanassociated with said conduit, a bypass duct in the conduitbetween the i'an and the port last mentioned, means for heating aportion of said bypass duct, and adjustable damper means for controllingthe proportion of air shunted through the bypass duct from said conduit.

7. An air conditioning apparatus comprising in combination, a steamdischarge jet, means for moving unclean air past the jet and intointimate association with the steam, to destroy odors and saturate theair with moisture. a dehumidifying condensing chamber including an airentry port and an air discharging port, for the continuous movement of acurrent of air through the chamber, refrigerating means locatedexteriorly of said chamber for maintaining the chamber walls below thefreezing temperature of water, spaced baiiie means within the chamberand associated with the cold walls thereof to transfer to said walls theheat of the air-steam mixture moving through the chamber and across thebale means therein, and means for draining the chamber of accumulatedmatter condensed upon the walls and baiiies thereof, a conduit forconveying cleansed air from 'the discharging port, a suction fanassociated with said conduit, a bypass duct in the conduit between thefan and the port last mentioned, means for heating a portion of saidbypass duct, a damper for controlling the proportion of air shuntedthrough the bypass duct from said conduit, and proportioning controlmeans thermostaticaliy governed to establish various adjusted positionsof the damper in correspondency with changes in the surrounding airtemperatures.

ANDREW P. CLARK.

